Answer:
with what you didnt put a question, math equation or a attachment
Answer:
The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods.
Explanation:
Answer:
the mass number is the number of protons and neutrons added and the average atomic mass is the weight of the protons and neutrons
The answer is Rubidium (Rb)
Explanation:
Certain materials, called conductors, allow electric charge to move pretty freely through them. ... Other materials, like plastic and rubber, are called insulators because they don't allow electric charges to move through them.